/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.tom_roush.pdfbox.pdmodel.graphics.color;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.tom_roush.pdfbox.cos.COSArray;
import com.tom_roush.pdfbox.cos.COSBase;
import com.tom_roush.pdfbox.cos.COSDictionary;
import com.tom_roush.pdfbox.cos.COSName;

/**
 * A DeviceN Process Dictionary
 *
 * @author John Hewson
 */
public class PDDeviceNProcess
{
   private final COSDictionary dictionary;

   /**
    * Creates a new DeviceN Process Dictionary.
    */
   public PDDeviceNProcess()
   {
      dictionary = new COSDictionary();
   }

   /**
    * Creates a new  DeviceN Process Dictionary from the given attributes.
    * @param attributes a DeviceN attributes dictionary
    */
   public PDDeviceNProcess(COSDictionary attributes)
   {
      dictionary = attributes;
   }

   /**
    * Returns the underlying COS dictionary.
    * @return the underlying COS dictionary.
    */
   public COSDictionary getCOSDictionary()
   {
      return dictionary;
   }

   /**
    * Returns the process color space
    * @return the process color space
    * @throws IOException if the color space cannot be read
    */
   public PDColorSpace getColorSpace() throws IOException
   {
      COSBase cosColorSpace = dictionary.getDictionaryObject(COSName.COLORSPACE);
      if (cosColorSpace == null)
      {
         return null; // TODO: return a default?
      }
      return PDColorSpace.create(cosColorSpace);
   }

   /**
    * Returns the names of the color components.
    * @return the names of the color components
    */
   public List<String> getComponents()
   {
      COSArray cosComponents = dictionary.getCOSArray(COSName.COMPONENTS);
      if (cosComponents == null)
      {
         return new ArrayList<String>(0);
      }
      List<String> components = new ArrayList<String>(cosComponents.size());
      for (COSBase name : cosComponents)
      {
         components.add(((COSName)name).getName());
      }
      return components;
   }

   @Override
   public String toString()
   {
      StringBuilder sb = new StringBuilder("Process{");
      try
      {
         sb.append(getColorSpace());
         for (String component : getComponents())
         {
            sb.append(" \"");
            sb.append(component);
            sb.append('\"');
         }
      }
      catch (IOException e)
      {
         sb.append("ERROR");
      }
      sb.append('}');
      return sb.toString();
   }

}
